From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: Florian Weimer <fweimer@redhat.com>, libc-alpha@sourceware.org
Subject: Re: [PATCH v4 2/3] Linux: Implement a useful version of _startup_fatal
Date: Thu, 5 May 2022 14:29:11 -0300 [thread overview]
Message-ID: <655165a2-dd15-7372-9421-73c178b8b509@linaro.org> (raw)
In-Reply-To: <71808d9fc272aa3cfb78c905dd5aedd39bb903f6.1651762968.git.fweimer@redhat.com>
On 05/05/2022 12:07, Florian Weimer via Libc-alpha wrote:
> On i386 and ia64, the TCB is not available at this point.
LGTM, thanks.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
> ---
> v4: Unchanged.
> v3: Use 2022 copyright year. Fix “statup” typo. Use __message_length
> local variable in _startup_fatal.
> sysdeps/unix/sysv/linux/i386/startup.h | 23 +++------------
> sysdeps/unix/sysv/linux/ia64/startup.h | 22 +++++++++++++++
> sysdeps/unix/sysv/linux/startup.h | 39 ++++++++++++++++++++++++++
> 3 files changed, 65 insertions(+), 19 deletions(-)
> create mode 100644 sysdeps/unix/sysv/linux/ia64/startup.h
> create mode 100644 sysdeps/unix/sysv/linux/startup.h
>
> diff --git a/sysdeps/unix/sysv/linux/i386/startup.h b/sysdeps/unix/sysv/linux/i386/startup.h
> index 67c9310f3a..213805d7d2 100644
> --- a/sysdeps/unix/sysv/linux/i386/startup.h
> +++ b/sysdeps/unix/sysv/linux/i386/startup.h
> @@ -1,5 +1,5 @@
> /* Linux/i386 definitions of functions used by static libc main startup.
> - Copyright (C) 2017-2022 Free Software Foundation, Inc.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> This file is part of the GNU C Library.
>
> The GNU C Library is free software; you can redistribute it and/or
> @@ -16,22 +16,7 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> -#if BUILD_PIE_DEFAULT
> -/* Can't use "call *%gs:SYSINFO_OFFSET" during statup in static PIE. */
> -# define I386_USE_SYSENTER 0
> +/* Can't use "call *%gs:SYSINFO_OFFSET" during startup. */
> +#define I386_USE_SYSENTER 0
>
> -# include <sysdep.h>
> -# include <abort-instr.h>
> -
> -__attribute__ ((__noreturn__))
> -static inline void
> -_startup_fatal (const char *message __attribute__ ((unused)))
> -{
> - /* This is only called very early during startup in static PIE.
> - FIXME: How can it be improved? */
> - ABORT_INSTRUCTION;
> - __builtin_unreachable ();
> -}
> -#else
> -# include_next <startup.h>
> -#endif
> +#include_next <startup.h>
> diff --git a/sysdeps/unix/sysv/linux/ia64/startup.h b/sysdeps/unix/sysv/linux/ia64/startup.h
> new file mode 100644
> index 0000000000..77f29f15a2
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/ia64/startup.h
> @@ -0,0 +1,22 @@
> +/* Linux/ia64 definitions of functions used by static libc main startup.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +/* This code is used before the TCB is set up. */
> +#define IA64_USE_NEW_STUB 0
> +
> +#include_next <startup.h>
> diff --git a/sysdeps/unix/sysv/linux/startup.h b/sysdeps/unix/sysv/linux/startup.h
> new file mode 100644
> index 0000000000..39859b404a
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/startup.h
> @@ -0,0 +1,39 @@
> +/* Linux definitions of functions used by static libc main startup.
> + Copyright (C) 2017-2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#ifdef SHARED
> +# include_next <startup.h>
> +#else
> +# include <sysdep.h>
> +
> +/* Avoid a run-time invocation of strlen. */
> +#define _startup_fatal(message) \
> + do \
> + { \
> + size_t __message_length = __builtin_strlen (message); \
> + if (! __builtin_constant_p (__message_length)) \
> + { \
> + extern void _startup_fatal_not_constant (void); \
> + _startup_fatal_not_constant (); \
> + } \
> + INTERNAL_SYSCALL_CALL (write, STDERR_FILENO, (message), \
> + __message_length); \
> + INTERNAL_SYSCALL_CALL (exit_group, 127); \
> + } \
> + while (0)
> +#endif /* !SHARED */
next prev parent reply other threads:[~2022-05-05 17:29 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-05 15:06 [PATCH v4 1/3] ia64: Always define IA64_USE_NEW_STUB as a flag macro Florian Weimer
2022-05-05 15:07 ` [PATCH v4 2/3] Linux: Implement a useful version of _startup_fatal Florian Weimer
2022-05-05 15:28 ` Andreas Schwab
2022-05-05 15:43 ` Florian Weimer
2022-05-05 17:29 ` Adhemerval Zanella [this message]
2022-05-05 15:08 ` [PATCH v4 3/3] csu: Implement and use _dl_early_allocate during static startup Florian Weimer
2022-05-05 17:48 ` Adhemerval Zanella
2022-05-05 18:03 ` Florian Weimer
2022-05-05 18:25 ` Adhemerval Zanella
2022-05-06 10:00 ` Florian Weimer
2022-05-06 13:04 ` Adhemerval Zanella
2022-05-06 13:19 ` Adhemerval Zanella
2022-05-09 16:10 ` Florian Weimer
2022-05-09 16:52 ` Adhemerval Zanella
2022-05-09 17:08 ` Florian Weimer
2022-05-09 17:37 ` Adhemerval Zanella
2022-05-05 17:28 ` [PATCH v4 1/3] ia64: Always define IA64_USE_NEW_STUB as a flag macro Adhemerval Zanella
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=655165a2-dd15-7372-9421-73c178b8b509@linaro.org \
--to=adhemerval.zanella@linaro.org \
--cc=fweimer@redhat.com \
--cc=libc-alpha@sourceware.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).